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No, these assemblies compress and push fuel upwards. You need to soak these things a few days (dont be in a rush) and see what they do.

I don't know who you paid to look at these pumps... but it doesnt sound like they did much of anything for you. Take them out of the machine, and let them sit in a bucket of carb cleaner for a couple days. Take them out after, and bench test them (compress them to see if you get fuel pumping out...

How easily do the pumps rotate in your hand? Can you rotate the inlet barb with ease?

If the rack isnt moving when you are putting it back in, its not in the rack. Its really not a big deal if you take all 4 pumps out, to get them back in the rack. It just takes a little trick to know what you are feeling for on the rack (a small locator, which you can see on the TMs that would...

I am not certain, but I think the shims may vary between the engines because of tolerance issues with after-cast grinding (with the block being cast iron after all). I would imagine these would have been 'paired' at the time of assembly with each lobe. Some spots may have required additional...

The 803 I am preparing for shipment appears to have (1) plate and (1) shim per metering pump, just like it appears in the TM. I did not disassemble, but each appears to have only one of each in place. Will check other machines later.

Another avenue might be to reach out to Gary over at DES (https://diesel-electric.us/). He has extensive experience with the Alpha series (LPW... which this engine is), and might know immediately what the answer is.

In the -24P pertaining to the engine in this set, that item is called out as quantity V. I believe either they were shimmed individually at the factory, or each location has a different amount of shims. I'd have to put a set of eyes on a few here... see if there is any consistency between machines.